lure

Thread Pools

Thread pools on the JVM should usually be divided into the following three categories:

1. CPU-bound
2. Blocking IO
3. Non-blocking IO polling

Each of these categories has a different optimal configuration and usage pattern.

lure

WSL default user and preserve file cetting( ~/.ssh)

To puth into /etc/wsl.conf

If chmod or chown takes no effect on files disk should be mounted with metadata like this.

[automount]
options = "metadata"

Sometimes WSL decide to start the session as a root. Fix it with this snippet

lure

object Main extends App {
  AvoidLosingGenericType.run()
  AvoidMatchingOnGenericTypeParams.run()
  TypeableExample.run()
  TypeTagExample.run()
}

class Funky[A, B](val foo: A, val bar: B) {
  override def toString: String = s"Funky($foo, $bar)"
}

lure

task compileGwt (dependsOn: classes, type: JavaExec) {
    buildDir = "${project.buildDir}/gwt"
    extraDir = "${project.buildDir}/extra"
     
    inputs.source sourceSets.main.java.srcDirs
    inputs.dir sourceSets.main.output.resourcesDir
    outputs.dir buildDir
     
    // Workaround for incremental build (GRADLE-1483)
    outputs.upToDateSpec = new org.gradle.api.specs.AndSpec()

lure

package fpmax

import scala.util.Try
import scala.io.StdIn.readLine

object App0 {
  def main: Unit = {
    println("What is your name?")

    val name = readLine()

lure

  import scala.reflect.macros.whitebox
  import scala.language.experimental.macros


  def symbolic_impl(c: whitebox.Context)(f: c.Expr[String]): c.Expr[scala.Symbol] = {
    import c.universe._
    c.Expr(q"""scala.Symbol(${c.eval[String](f)})""")
  }
  def symbolic(f: String): scala.Symbol = macro symbolic_impl

lure

import cats.implicits._

//https://stackoverflow.com/questions/48744146/stacking-m-either-and-writer

object SafeLogWriter {
  type FutureErrorOr[A] = EitherT[Future, Error, A]
  type ErrorOr[A] = Either[Error, A]
  type MyWriter[A] = WriterT[Future, Vector[String], A]
  type MyStack[A] = EitherT[MyWriter, Error, A]

lure

-- View pg_stat_activity with temporary files informations (file list and total file size)
-- version 0.3

SELECT
        pg_stat_activity.pid AS pid,
        CASE WHEN LENGTH(pg_stat_activity.datname) > 16
            THEN SUBSTRING(pg_stat_activity.datname FROM 0 FOR 6)||'...'||SUBSTRING(pg_stat_activity.datname FROM '........$')
            ELSE pg_stat_activity.datname
            END
        AS database,

lure

#!/bin/bash

SOURCE="$1"
if [ "${SOURCE}" == "" ]; then
    echo "Must specify a source url"
    exit 1
fi

DEST="$2"
if [ "${DEST}" == "" ]; then

lure

Additional resources

• http://www.scala-sbt.org/sbt-pgp/usage.html
• https://github.com/scalacenter/sbt-release-early/wiki/How-to-create-a-gpg-key

Create Account in Sonatype Issue tracker

https://issues.sonatype.org/projects/OSSRH

Create Issue with desired groupId

https://issues.sonatype.org/secure/CreateIssue.jspa?issuetype=21&pid=10134